One one hand we’re told that two blind men received their sight because of their faith:
Matthew 9:29-20 Then [Jesus] touched their eyes and said, ‘Because of your faith, it will happen.’ Then their eyes were opened …
On the other hand, when Jesus went back to Nazareth (where he grew up) and began teaching and doing miracles, the people scoffed and Jesus could do very little for them:
Mark 6:3-5 ‘He’s just a carpenter, the son of Mary’ and the brother of James, Joseph, Judas, and Simon. And his sisters live right here among us.’ They were deeply offended and refused to believe in him.
And because of their unbelief, he couldn’t do any miracles among them except to place his hands on a few sick people and heal them. And he was amazed at their unbelief.
Even though it is all a matter of God’s grace, faith is obviously important: there is an element of wanting to believe for things to happen.
And interestingly, most of us (in Australia, anyway) would be happy to place our hands on a few sick people and heal them; yet for Jesus, this wasn’t regarded as much at all.